I did not ban IP otherwise I could not be here to write.
For your information, using VPN(or any other methods to anonymize oneself) to evade an IP ban is a common knowledge to everyone who can fluently use a computer and the internet. You being able to post here is not a good enough proof to prove that your original IP hasn't been banned.
these users pay to spam? What stops the admin from deleting these posts?
They are not paying to spam the forum. The answer to your question(and the reason why they still are not banned) is already answered a while ago:
probably the mods have been quite busy with all these kind of activities.
Moderators are humans, It is unfair to think that they can monitor each and every message posted in the forum as
more than 8000 posts are posted in an average day! Therefore as members of the forum whose intentions are on the well being of the forum we must do our part by reporting them!